Method of making stay-bolts.



E. I. DODDS.

METHOD OF MAKING STAY BOLTS.

APPLICATION FILED JULY 6.1914.

1326,4800 Patented May15,1917.

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ETI-IAN I. DODDS, OF ZELIENOPLE, PENNSYLVANIA, ASSIGNOB. T0 KERNER MANUFAC- TURING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

Specification of'Letters Patent.

METHOD OF MAKING STAY-BOLTS.

Patented May 15, 1911 "1?.

To all whom may concern.

Be it known that I, Err-IAN 1. Downs, a citizen of the United States, residing at Zelienople, in the county of Butler and. State of Pennsylvania, have invented a new and useful Method of Making Stay-Bolts, of which the following is a full, clear, and exact description reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is an end view of a blank from which I make bolts by my improved method.

Fig. 2 is a similar view of another form of blank.

Fig. 3 is a similar view of still another form of blank.

Figs. 4, 5 and 6 are similar views of other forms of blanks.

Fig. 7 is a transverse sectional view through a die showing the blank after a portion has been punched out.

Fig. 8 is a transverse sectional view of the dies for forming the body and head of a bolt after the blank has passed through the dies of Fig. 7.

Fig. 9 is a side elevation of a finished bolt.

Fig. 10 is a plan view of a blank after it has been pierced and spread Without removing any of the metal.

Fig. 11 is a similar view of a blank after it has passed through the second step of the process, and

Fig. 12 is a plan view of the bolt after it has passed through the next step of the process.

The object of my invention is to provide a method of manufacturing bolts in which the work of punching or piercing dies is reduced to a minimun By the methods heretofore used, the body of the blank was pierced or punched at its greatest diameter, so that the piercing or punching dies were subjected to severe strains.

The precise nature of my'invention will be best understood by reference to the accompanying drawings which will now be described, it being premised, however, that changes may be made in steps of the method without departing from the spirit and scope of my invention, as defined in the appended claims.

Referring to the drawings, the numeral 2 designates the blanks used for carrying out my method. The width of these blanks is considerably greater than the thickness and I also provide a reduced portion such as shown at 3 in the blanks. These blanks are placed in a pair of dies l, and a portion of the center of a blank is removed by means of a punch 1 The punched blank is then placed between forming dies 5 to shape the body and the heads, the heads being somewhat larger in diameter than the body por tion, the difference in cross-sectional area being equal to the amount punched out by the punch 4t. After the bolt has been formed, the body member may be twisted about the longitudinal axis thereof and the heads screw-threaded or shaped in any desirable manner.

If desired, I can make the bolts from blanks such as shown in Figs. 1 to 6 by first piercing the center of the blanks and separating the two central members without removing any of the material, as indicated at 6 in Fig. 10, and then closing the opening and shaping the entire bolt to a cylindrical form. After the body has been shaped, as shown in Fig. 11, the ends are upset to form the heads 7. The bolt can then be finished in the usual manner or, if desired, the body can be twisted about the longitudinal axis before the heads are upset.

The advantages of my invention result from the provision of a method of making bolts whereby the work of the piercing or punching dies is reduced to a minimum.

I claim:

1. The method of making bolts, consisting in providing a blank having a reduced central portion, then removing a portion of the metal from the reduced central portion along the longitudinal axis, and then closing said opening and shaping the body and heads of said bolt; substantially as described.

2. The method of making stay bolts having enlarged heads from a blank Whose cross and shaping the body and head of the bolt; 10 sectional area is approximately equal to the substantially as described.

cross sectional area of the enlarged heads, In testimony whereof, I have hereunto set and Which is of greater Width than thickmy hand.

ness, com risin the ste 3 of removin a 01'- tion of tlib main from the thinnest dir en- ETHAN DODDS sion of the blank along the longitudinal axis Witnesses:

thereof, to form a longitudinal opening GEO. B. BLEMING,

therethrough, and then closing said opening Jnssn B. HELLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

